Abstract
In order to investigate the effect of crosslinking degree on the water uptake, swelling ratio, and methanol permeability of sulfonated poly(aryl ether nitrile)s (SPENs), the molar content of sulfonated group in bisphenol monomer is fixed at 60% in this work. The properties of sulfonated poly (aryl ether nitrile) with different crosslinking degrees are studied by changing the content of propenyl group in sulfonated poly (aryl ether nitrile)s. The cross-linking reaction of the propenyl groups in the SPENs is cured at 230 °C. All the results show that this method is an effective way to improve the water uptake, swelling ratio, and methanol permeability to meet the application requirements of the SPENs membranes as proton exchange membranes in fuel cells.
Highlights
Interest has recently increased in direct methanol fuel cells (DMFCs), which directly convert chemical fuels to electricity with high efficiency by utilizing methanol as the fuel [1,2,3,4,5]
The results showed that sulfonated poly with the side chain propenyl group cross-linked possesses the best performance when the content of sulfonated group reaches 60%
Novel sulfonated poly(aryl ether nitrile)s have been synthesized through fixing the molar content of sulfonated group in bisphenol monomer at 60%, and tuning the content of the propenyl group in sulfonated poly(aryl ether nitrile)s
Summary
Interest has recently increased in direct methanol fuel cells (DMFCs), which directly convert chemical fuels to electricity with high efficiency by utilizing methanol as the fuel [1,2,3,4,5]. Synthesized a series of sulfonated polyaryl ether nitriles (m-SPAEENs) with the same sulfonic acid content by controlling the ratio of binary phenol monomer Their water uptake and proton conductivity were compared with those of BPSHs and Nafion. Kim et al [39] confirmed that the ratio of proton conductivity to water absorption of sulfonated poly (aryl ether nitrile) is higher than that of sulfonated poly (aryl ether sulfone) within a certain IEC range This is mainly due to the strong dipole interaction between the molecular chains of copolymers containing the nitrile group, which limits the swelling in water. This is mainly ascribed to the strong dipole interaction between the copolymer chains containing the nitrile group, which can make the film physically cross-linked, having good water retention and dimensional stability. The effects of the crosslinking degree on membrane properties such as dimensional stability, water uptake, methanol permeability, proton conductivity, and selectivity have been investigated
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